I agree, I absolute don't care about the thinness of my phone (within reason). It wouldn't bother me in the least if my phone was say...an inch thick. I would probably actually enjoy the heft of such a device. When I'm holding it as a phone or using it as a portable computer, there's a huge gap between the back of the phone and my hand. If I'm holding it horizontal and playing games on it, it's already too thin to hold comfortably.

Now my tablet...I think it could be lighter since the use cases for it are very different.